Improve mutation coverage

[uhafner]

No description provided.

[codecov]

Codecov Report

Merging #46 into master will increase coverage by 3.40%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #46      +/-   ##
============================================
+ Coverage     87.43%   90.83%   +3.40%     
- Complexity      109      117       +8     
============================================
  Files            14       14              
  Lines           358      360       +2     
  Branches         10       10              
============================================
+ Hits            313      327      +14     
+ Misses           43       31      -12     
  Partials          2        2              

Impacted Files	Coverage Δ	Complexity Δ
...kins/plugins/grading/AggregatedScoreXmlStream.java	100.00% <ø> (ø)	3.00 <0.00> (ø)
...io/jenkins/plugins/grading/PercentagePieChart.java	100.00% <100.00%> (+100.00%)	7.00 <3.00> (+7.00)
...java/io/jenkins/plugins/grading/AnalysisScore.java	100.00% <0.00%> (+5.26%)	7.00% <0.00%> (+1.00%)

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